Visitors to the Ah-Tah-Thi-Ki Seminole Museum regard a letter dated February 9, 1774 on display in 2006. The letter was written by John Moultrie, the Lieutenant Governor of then British East Florida and addressed to 'The Cowkeeper, the founder of the Seminole Tribe of Florida' in which Moultrie asks The Cowkeeper for peace between the Seminoles and the British. Joe Raedle/Getty Images hide caption

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In this August 2015 file photo, plants burned in the Rocky Fire are shown near Lower Lake, Calif. NPR's environment and climate change reporting encompasses related topics such as wildfires, drought, and other natural disasters. Jeff Chiu/AP hide caption

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Former NPR science correspondent (and now host of Science Friday) Ira Flatow interviews a few penguins while reporting from Antarctica in 1979. NPR's environment reporting has increased and expanded greatly since. Katherine Bouton/ hide caption

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A migrant arrives with his son on the shore near the village of Skala Sikaminea, on the southeastern Greek island of Lesbos, Greece on Friday. Greece this year has been overwhelmed by record numbers of migrants arriving on its eastern Aegean islands, with more than 160,000 landing so far. [Caption from AP, lightly edited.] Visar Kryeziu/AP hide caption

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